This is the Solderable Breadboard PCB. This Solderable breadboards are greatly used for prototyping and experimenting, Which is similar to our regular Solderless breadboard with the same connections to pins and power rails, but they are mechanically robust, that is in Solderless breadboard it seems like somewhere, something is always coming loose, so having a Solderable breadboard with a matching trace pattern allows you to make a prototype more solid without having to lay out a custom PCB.
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